I don't remember what classes get it, it should say on the book iteself in the description. The skill allows you to teleport from a distance of around 600 to your target. The enemy drops you from target if they had you in target. They also stop moving when you do it (like a 1sec stun).
The book just says Dagger Classes. I guess all dagger classes get it. One more thing, do you have to be flagged to use that skill or can you use it non flagged?